A Point Process Modelling Approach to Raised Incidence of a Rare Phenomenon in the Vicinity of a Prespecified Point

1990 ◽  
Vol 153 (3) ◽  
pp. 349 ◽  
Author(s):  
Peter J. Diggle
Keyword(s):  
Point Process ◽  
Process Modelling ◽  
Rare Phenomenon ◽  
Modelling Approach

scholarly journals Modelling the Spatial Structure of White Spruce Plantations and Their Changes after Various Thinning Treatments

Forests ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 740
Author(s):  
Emmanuel Duchateau ◽  
Robert Schneider ◽  
Stéphane Tremblay ◽  
Laurie Dupont-Leduc ◽  
Hans Pretzsch
Keyword(s):  
Spatial Distribution ◽  
Point Process ◽  
Spatial Information ◽  
Abies Balsamea ◽  
Basal Area ◽  
White Spruce ◽  
Process Modelling ◽  
Ecological Processes ◽  
Short Period ◽  
Modelling Approach

Research Highlights: The spatial distribution of trees results from several ecological processes that can be difficult to measure. We applied a point process modelling approach that uses the diameter and species of neighbouring trees to represent inter-tree interactions through repulsive and attractive processes. Thinning treatments slightly influence the tree spatial distribution of trees in white spruce plantations. Integrating this “spatialiser” into growth models could help improve stand simulations following various thinning treatments over larger areas and longer periods. It could also allow for the use of spatially explicit models when tree position is not available. Background and Objectives: Tree spatial patterns result from several ecological processes and have important implications in forest ecology and management. The use of spatial information can significantly improve our understanding of forest structures. However, this implies intensive field work that is rarely integrated into forest inventories. The aims of this study were to develop a spatial distribution simulator of trees in white spruce plantations and to evaluate the influence of thinning treatments. Materials and Methods: A point process modelling approach was used to represent inter-tree interactions through repulsive and attractive process in white spruce (Picea glauca (Moench) Voss) plantations in eastern Quebec, Canada, that had been commercially thinned five years ago. Balsam fir (Abies balsamea (L.) Mill.) and hardwoods together can represent 30–40% of the basal area of these plantations. Results: The diameter and species of each tree’s two closest neighbours were found to be the most important predictors in explaining the observed distances between trees. Despite the short period since thinning treatments, results showed that the treatment had slight significant effects on tree interactions. However, their impact on the global spatial distribution of stands is quite limited. Conclusions: Using only a few readily-available variables (species and diameter of trees), this “spatialiser” will make it possible to assign spatial coordinates to trees and generate realistic stand spatial structures even after various silvicultural treatments.

scholarly journals A process modelling approach to the evaluation of ship machinery configuration alternatives of LNG carriers

2016 ◽  
Vol 19 (3) ◽  
pp. 146 ◽  
Author(s):  
George G Dimopoulos ◽  
Iason V Stefanatos ◽  
Nikolaos M.P Kakalis
Keyword(s):  
Process Modelling ◽  
Modelling Approach

Towards a reusable business process modelling approach

2020 ◽  
Vol 10 (2) ◽  
pp. 104
Author(s):  
Denis Silva Da Silveira ◽  
Eliane Maria Loiola ◽  
N.A. Jo�ã ◽  
o Araújo ◽  
Ana Moreira ◽  
...  
Keyword(s):  
Business Process ◽  
Process Modelling ◽  
Business Process Modelling ◽  
Modelling Approach

scholarly journals Sex-linked genetic diversity originates from persistent sociocultural processes at microgeographic scales

2019 ◽  
Vol 6 (8) ◽  
pp. 190733
Author(s):  
Ning Ning Chung ◽  
Guy S. Jacobs ◽  
Herawati Sudoyo ◽  
Safarina G. Malik ◽  
Lock Yue Chew ◽  
...  
Keyword(s):  
Population Genetic ◽  
Historical Context ◽  
Process Modelling ◽  
Genetic Studies ◽  
Complex Interactions ◽  
Testing Complex ◽  
Sociocultural Processes ◽  
The Individual ◽  
Modelling Approach ◽  
Individual Human

Population genetics has been successful at identifying the relationships between human groups and their interconnected histories. However, the link between genetic demography inferred at large scales and the individual human behaviours that ultimately generate that demography is not always clear. While anthropological and historical context are routinely presented as adjuncts in population genetic studies to help describe the past, determining how underlying patterns of human sociocultural behaviour impact genetics still remains challenging. Here, we analyse patterns of genetic variation in village-scale samples from two islands in eastern Indonesia, patrilocal Sumba and a matrilocal region of Timor. Adopting a ‘process modelling’ approach, we iteratively explore combinations of structurally different models as a thinking tool. We find interconnected socio-genetic interactions involving sex-biased migration, lineage-focused founder effects, and on Sumba, heritable social dominance. Strikingly, founder ideology, a cultural model derived from anthropological and archaeological studies at larger regional scales, has both its origins and impact at the scale of villages. Process modelling lets us explore these complex interactions, first by circumventing the complexity of formal inference when studying large datasets with many interacting parts, and then by explicitly testing complex anthropological hypotheses about sociocultural behaviour from a more familiar population genetic standpoint.

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